Tonight the record-breaking heat wave intensifying and pushing east and the tropical

threat we're tracking in the Gulf. The dangerous heat impacting more than 70 million

from Iowa to Maine scorching temperatures set to last for days.

Amid the heat in Massachusetts, 911 services knocked out statewide for hours,

and in the west dozens of wildfires burning,

a state of emergency in New Mexico, thousands forced to

evacuate. And the warning in Texas, the first potential tropical storm of the

year taking aim. Al Roker is tracking at all.

Also, tonight President Biden's new executive action shielding 500,000 undocumented spouses of

U.S. citizens from deportation.

Who will qualify?

And Republicans attacking the plan as amnesty.

Boeing CEO on Capitol Hill testifying for the first time

since that door plug blowout.

The dramatic moment in the room, his apology to families of 737 Max crash victims,

and the grilling he faced after yet another Boeing whistleblower comes forward.

Justin Timberlake arrested in the Hamptons for DWI,

a mug shot just out, what he allegedly told the officer about how much he had to drink.

This is NBC Nightly News with Lester Holt.

Good evening and welcome.

Tonight, millions more on her heat alerts,

says the blanket of brutally hot air we've been watching

...